1 This patch applies a workaround for an ARM EABI issue, where clang would
2 sometimes incorrectly align the stack in a leaf function that uses TLS.
4 Introduced here: http://svnweb.freebsd.org/changeset/base/252503
6 Index: test/CodeGen/Thumb2/large-stack.ll
7 ===================================================================
8 --- test/CodeGen/Thumb2/large-stack.ll
9 +++ test/CodeGen/Thumb2/large-stack.ll
10 @@ -13,7 +13,7 @@ define void @test1() {
11 define void @test2() {
12 ; DARWIN-LABEL: test2:
13 ; DARWIN: sub.w sp, sp, #4160
15 +; DARWIN: sub sp, #12
17 ; LINUX: sub.w sp, sp, #4160
19 Index: test/CodeGen/ARM/2009-10-30.ll
20 ===================================================================
21 --- test/CodeGen/ARM/2009-10-30.ll
22 +++ test/CodeGen/ARM/2009-10-30.ll
25 define void @f(i32 %a1, i32 %a2, i32 %a3, i32 %a4, i32 %a5, ...) {
27 -;CHECK: sub sp, sp, #4
28 -;CHECK: add r{{[0-9]+}}, sp, #8
29 -;CHECK: str r{{[0-9]+}}, [sp], #4
30 +;CHECK: sub sp, sp, #8
31 +;CHECK: add r{{[0-9]+}}, sp, #12
32 +;CHECK: str r{{[0-9]+}}, [sp, #4]
33 +;CHECK: add sp, sp, #8
35 %ap = alloca i8*, align 4
36 %ap1 = bitcast i8** %ap to i8*
37 Index: test/CodeGen/ARM/vargs_align.ll
38 ===================================================================
39 --- test/CodeGen/ARM/vargs_align.ll
40 +++ test/CodeGen/ARM/vargs_align.ll
41 @@ -15,8 +15,8 @@ entry:
42 return: ; preds = %entry
43 %retval2 = load i32* %retval ; <i32> [#uses=1]
45 -; EABI: add sp, sp, #12
46 ; EABI: add sp, sp, #16
47 +; EABI: add sp, sp, #16
48 +; OABI: add sp, sp, #16
49 ; OABI: add sp, sp, #12
50 -; OABI: add sp, sp, #12
52 Index: test/CodeGen/ARM/prefetch-thumb.ll
53 ===================================================================
54 --- test/CodeGen/ARM/prefetch-thumb.ll
55 +++ test/CodeGen/ARM/prefetch-thumb.ll
56 @@ -10,8 +10,8 @@ entry:
61 -;THUMB2: pld [sp, #50]
62 +;THUMB2: pld [sp, #4]
63 +;THUMB2: pld [sp, #54]
65 %red = alloca [100 x i8], align 1
66 %0 = getelementptr inbounds [100 x i8]* %red, i32 0, i32 0
67 Index: lib/Target/ARM/ARMFrameLowering.h
68 ===================================================================
69 --- lib/Target/ARM/ARMFrameLowering.h
70 +++ lib/Target/ARM/ARMFrameLowering.h
71 @@ -27,7 +27,7 @@ class ARMFrameLowering : public TargetFrameLowerin
74 explicit ARMFrameLowering(const ARMSubtarget &sti)
75 - : TargetFrameLowering(StackGrowsDown, sti.getStackAlignment(), 0, 4),
76 + : TargetFrameLowering(StackGrowsDown, sti.getStackAlignment(), 0, 8),